1. A: Leibniz GW (1923) Sämtliche Schriften und Briefe. Akademie der Wissenschaften zu Berlin. Reichl, Darmstadt/Akademie-Verlag, Berlin
2. C: Leibniz GW (1903) Opuscules et Fragments Inédits de Leibniz: extraits de la Bibliothèque royale de Hanovre (ed: Couturat L). Alcan, Paris
3. CM: Cram D, Maat J (eds) (2001) George Dalgarno on universal language. The art of signs (1661), The deaf and dumb man’s tutor (1680), and the unpublished papers. Oxford University Press, Oxford
4. CSMK: Descartes R (1991) The philosophical writings of Descartes: the correspondence (trans: Cottingham J, Stoothoff R, Murdoch D, Kenny A). Cambridge University Press, Cambridge
5. DI: Aristotle (1984) De interpretatione. In: Barnes J (ed) The complete works of Aristotle, vol. 1. Princeton University Press, Princeton, pp 25–39